AWS::SSM::MaintenanceWindow

The AWS::SSM::MaintenanceWindow resource represents general information about a
Maintenance Window for Amazon EC2 Systems Manager. Maintenance Windows let you define
a schedule for when to
perform potentially disruptive actions on your instances—such as patching an operating
system (OS), updating drivers, or installing software. Each Maintenance Window has
a schedule, a
duration, a set of registered targets, and a set of registered tasks. For more information,
see
Systems Manager Maintenance Windows in the Amazon EC2 Systems Manager User Guide
and
CreateMaintenanceWindow in the Amazon EC2 Systems Manager API Reference.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

Properties

Enables a Maintenance Window task to execute on managed instances, even if you
haven't registered those instances as targets. If this is enabled, then you must specify
the unregistered instances (by instance ID) when you register a task with the
Maintenance Window.